[Openswan Users] No response (or no acceptable response) to our first IKE message

[Sam]

Hi,

I have successfully installed Openswan but there seem to an issue with the
connection to the Cisco VPN or on the network. From the logs am seeing
something like "*No response (or no acceptable response) to our first IKE
message*".

Below is the full log and my config. I will really appreciate your help.

###################### CONFIG #############################
config setup
        interfaces=%defaultroute
        plutoopts="--perpeerlog"
        protostack=netkey


conn VPNCon
        type=tunnel
        authby=secret
        Ikelifetime=86400s
        phase2=esp
        Phase2alg=3des-md5;modp1536
        lifetime=3600s
        forceencaps=yes
        pfs=no
        keyexchange=ike
        left=1.2.3.4
        leftnexthop=%defaultroute
        right=5.6.7.8
        rightnexthop=%defaultroute
        rekey=yes
        remote_peer_type=cisco
        auto=start
###################################################


###################### LOG #############################
Jan 12 04:38:44 localhost pluto[21844]: added connection description
"VPNCon"
Jan 12 04:38:44 localhost pluto[21844]: listening for IKE messages
Jan 12 04:38:44 localhost pluto[21844]: adding interface eth0/eth0
1.2.3.4:500
Jan 12 04:38:44 localhost pluto[21844]: adding interface eth0/eth0
1.2.3.4:4500
Jan 12 04:38:44 localhost pluto[21844]: adding interface lo/lo 127.0.0.1:500
Jan 12 04:38:44 localhost pluto[21844]: adding interface lo/lo
127.0.0.1:4500
Jan 12 04:38:44 localhost pluto[21844]: adding interface lo/lo ::1:500
Jan 12 04:38:44 localhost pluto[21844]: loading secrets from
"/etc/ipsec.secrets"
Jan 12 04:38:44 localhost pluto[21844]: "VPNCon" #2: initiating Main Mode
Jan 12 04:51:54 localhost pluto[21844]: "VPNCon" #2: max number of
retransmissions (20) reached STATE_MAIN_I1.  No response (or no acceptable
response) to our first IKE message
Jan 12 04:51:54 localhost pluto[21844]: "VPNCon" #2: starting keying
attempt 2 of an unlimited number
Jan 12 04:51:54 localhost pluto[21844]: "VPNCon" #3: initiating Main Mode
to replace #2
########################################################
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